When negative moment section of beams are strengthened by using carbon fiber sheets,angle iron hold-down strip is a common mechanism anchorage method.

According to the structural mechanics principle and the basic differential equation of curved beam,the solution for internal force and deflection of nonradial simply supported indeterminate curved beam bridge under moment at beam end are derived.

Moment capacity of semi-rigid composite beam-column joints with flush end plate connections:I. under negative moment;

Bearing capacity calculation of steel-concrete composite beam under the action of negative moment;

Calculation suggestion about negative moment bending strength of the steel concrete composite beams;